Theoretical & Derivation based Questions and Answer. Unit Derive the condition for exact differentials. Solution:
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1 Theoretical & Derivation based Questions and Answer Unit Derive the condition for exact differentials. Solution:
2 2*. Derive the Maxwell relations and explain their importance in thermodynamics. Solution:
3 3. Starting from 1 st Maxwell relation and using cyclic relation, derive remaining three relations. Solution:
4
5 4*. Derive the equation for Clausius Clapeyron equation for evaporation of liquids. 5*. Explain the following (a) Coefficient of volume expansion (b) Joule Thomson coefficient (c) Isothermal compressibility. 6*. Explain the following a) What are primary fuels and secondary fuels? List some important primary and secondary fuels. b) What do you mean by stoichiometric air-fueln(a/f) ratio? c) Enthalpy of formation (ΔH f ) d) Heating values of fuel e) Adiabatic Flame Temperature For Numericals Refers class notes and solve previous year numerical questions Unit 2: 7. Classify the boiler briefly. 8*. Give the name of various mountings and accessories of boiler and also explain its functions. 9. What are the elements of steam condensing plant? Explain its function briefly. 10. State the comparison between jet and surface condenser. & Books 11. Explain briefly the effects of air leakage in a steam condenser? 12*. Explains briefly any one jet condenser with neat sketch. & Books 13*. With neat sketch, explain the working of evaporative condenser. & Books For Numericals Refers class notes and solve previous year numerical questions Unit Explain the various operation of a vapour carnot cycle. Also represent it on a T-s and p-v diagrams.
6 15*. Describe the different operation of Rankine cycle. Derive also the expression for its efficiency. What are the effects of pressure and temperature on rankine cycle? 16*. Explain the working with the help of neat diagram & also derive an expression for its thermal efficiency. Also explain its advantages and disadvantages (a) Reheat cycle (b) Regenerative cycle. (c) Binary vapour cycle. (d) Modified Rnakine cycle 17. Explain with neat sketch the construction and working of steam engine. 18*. Explain clearly what do you mean by saturation curve and missing quantity. Suggest the ways by which missing quantity can be reduced. For Numericals Refers class notes and solve previous year numerical questions Unit 04 19*. Derive the expression for mass flow rate per unit area of steam in a nozzle. Also give the condition for maximum discharge. 20. Define critical pressure ratio for the nozzle of steam turbine. Obtain analytically its value in term of index of expansion (n). 21*. What do you mean by a supersaturated flow? Explain with the help of h-s diagram. Answer: Refers book Thermal engineering by Er. R.K Rajput, Ch-18, page no What is the nozzle efficiency? Answer: it is defined as the ratio of the actual enthalpy drop to the isentropic enthalpy drop between the same pressures. 23*. Make a comparison between impulse turbine and reaction turbine.
7 24. Explain the working of a single stage impulse steam turbine. Sketch the pressure and velocity variations along the axis of the turbine. Answer:
8 25. Draw the velocity vector diagram of a single stage impulse turbine and set up expression for the axial thrust, tangential force, work done and diagram efficiency. 26*. Why compounding is done in steam turbine? Discuss the various methods of compounding steam turbine. Also discuss its salient features. 27*. Derive the condition for maximum efficiency of single stage impulse turbine and write its expression. Also plot efficiency vs blade speed ratio. 28**. Explain various methods used for governing of steam turbines. Answer:
9
10 For Numericals Refers class notes and solve previous year numerical questions For steam turbine problem prefer 1 st manual approach it time permits them go for 2 nd method graphical approach. Unit What is the difference between gas turbine Vs Steam turbine?
11 30*. Derive an expression for the air standard thermal efficiency of the Brayton cycle in terms of the compression ratio and adiabatic index. Solution:
12 31*. Prove that the optimal pressure ratio for maximum specific output for a gas turbine plant is given by r p = (T 3 /T 1 ) γ/2(γ-1), where T 3 and T 1 is the maximum and minimum temperate. or For a constant pressure closed cycle gas turbine, derive the mathematical Expression of optimum pressure ratio for maximum cycle thermal efficiency Solution: Up to work done do same as Q. no. 30, rearrange workdone in term of pressure ratio & differentiat it w.r. to pressure ratio & equate it to zero. For detail Refers class notes 32*. Discuss the influence of reheating, regeneration and intercooling on the performance of a gas turbine cycle. 33**. Explain with a neat sketch the working of (a) Turbojet engine (b) Turbo-prop engine (c) Rocket Engine Also discuss its application & advatages For Numericals Refers class notes and solve previous year numerical questions Solve both numerical of closed cycle gas turbine and open cycle gas turbine
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